Improvement in locks



UNITED STATES PATENT OEEIoE.

JOHN JETT, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN LOCKSJ.

Specification forming part of Letters Patent No. 209,8 l2, datedNovember 1:2, 1878; application led April 12, 1878.

To all whom t may concern:

Be it known that I, JOHN JETT, of the city and county of San Francisco,State of Galifornia, have invented a certain new and usefulImprovementin Tumbler-Locks, which invention is fully set forth in thefollowing specilication and accompanying` drawing.

The object I have in View is to produce a simple and cheap tumbler-lock,of such conipact construction that it can be made of small size for useupon doors or trunks, boxes, va' lises, or other small articles, andwill bevery secure. and durable. This I accomplish by employing a boltwith a recessed shank, in which recess are pivoted at their forward endsto the bolt a number of tumblers, which ll the recess and make the shankof the blt, with the tumblers attached, of the same thickness as thehead of the same. The bolt and tumblers are carried by a peculiarframe-work, the subject of this invention, which securely y holds andguides the moving parts of the lock, and is constructed as fullyhereinafter explained.

In the drawings, Figure l is a side view of the lock; Fig. 2, a separateview of the bolt and tumblers, Figs. 3 and 4, cross-sections of thelock, Figs. 5 and 6, views of the keys.

Like letters denote corresponding parts.

O is the bolt, with recessed shank 5 D, the pivoted tumblers, havinglocking-notches a g b, the springs for pressing the tumblers downwardly,E and F, the keys. Upon these parts I lay no claim.

The case or frame of the lock is composed of a rectangular plate, A, ofthe proper size, and having a key-hole or slot, a', in its lower edge.At one end of the back-plate A is secured at right angles thereto (orcast therewith) the face-plate C', through which the bolt is projectedwhen thrown. Near the other end of the plate A is secured or cast aplate, f, parallel with the face-plate, but not extending to the top ofthe back-plate, as does such faceplate.

The shank of the bolt and the tumblers slide over this plate f, and thenotches a g engage with the top of the same. Just above the catch-platej' is the saddle-plate el, secured to or cast with the back-plate atright angles to the face-plate and the strip e on the line of the boltand tumblers, and close against the side of the tumblers and bolt, so asto guide and steady the same in its movement.

By means of this frame the lock can be made very light and cheap. Theopen framework allows the lock to be easily fixed when out of orderwithout removing any part of the case. It also completely secures andguides the bolt, tumblers, and springs, and is sufficiently strong to bedurable in use.

I ain aware of the patent granted September 25, 1840, to Peter Rogers,and hereby disclaim the same.

What I claim as my invention :is-

The open case for a lock carrying a bolt with spring-tuinblers pivotedthereto, consisting of the back-plate A, with key-hole, the face-plateC', through which the end of the bolt projects, the plate f, with whichthe notches in the tumblers engage, the plates c1l e2, for guiding thetumbler-springs, the plate B, and the strips d e, all constructed andarranged substantially as described and shown. In testimony that I claimthe foregoing I have hereunto set my hand and seal this 18th day ofMarch, 1878.

JOHN JETT. lL. s.]

Witnesses:

C. W. M. SMITH, CEAS. E. KELLY.

